The workshop brings together a number of people who are working on electron collisions with atoms, ions, and molecules, heavy-particle collisions, and electronic structure of atoms and molecules (with structure viewed here as a prerequisite for collision calculations). The primary goals are to come up with reasonable uncertainty estimates for calculations using the various methods of collision physics: perturbative, nonperturbative, time-independent, time-dependent, semi-classical, etc. Generally, the workshop focus will be on theoretical atomic and molecular data relevant to fusion and astrophysical plasmas, where modeling codes mostly use theoretical atomic and molecular data for which assessments of their accuracy are necessary. There will also be data users at the meeting, as well as some who manage databases.